188685221866 has 16 divisors (see below), whose sum is σ = 299684581056. Its totient is φ = 88790659776.

The previous prime is 188685221839. The next prime is 188685221873. The reversal of 188685221866 is 668122586881.

It is a super-2 number, since 2×188685221866² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2393125 + ... + 2470711.

It is an arithmetic number, because the mean of its divisors is an integer number (18730286316).

Almost surely, 2^188685221866 is an apocalyptic number.

188685221866 is a deficient number, since it is larger than the sum of its proper divisors (110999359190).

188685221866 is a wasteful number, since it uses less digits than its factorization.

188685221866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149133.

The product of its digits is 17694720, while the sum is 61.

The spelling of 188685221866 in words is "one hundred eighty-eight billion, six hundred eighty-five million, two hundred twenty-one thousand, eight hundred sixty-six".